A couple year's ago we came back from a 3 month road trip and I thought I had a cold! I did the typical over the counter fixes for about two- three weeks but it just lingered on. Finally went in to see the doctor, he said, you probably picked up a virus on your travels and put me on antibiotics. Took that prescription for the 10 days, still no improvement and went on a stronger antibiotic and a chest X-Ray. The X-Ray was not conclusive but my primary care doctor got me in to see a Pulmonologist.
Long story short, after a Cat Scan, I did have Valley Fever. I had traveled thru Arizona, New Mexico and Texas. I had actually mentioned this possibility to my doctor (Valley Fever) on my very first visit but he didn't have enough experience to fully diagnose it(not uncommon).... fortunately the Pulmonologist did have experience in diagnosing and treating Valley Fever. Once on the Anti fungal drug...it cleared things up within a few weeks.
Unless you know for sure you don't have this pain in the Butt Fungus, it might be worth your time to have it checked out!